In connection with the Russian invasion of Ukraine, the story of the 13th century invasion of the Slavic lands by Batu Khan, grandson of Genghis Khan, and his Golden Horde. The Mongols destroyed (the then minor town) Moscow as well as the metropolis of Kyiv, subjecting the principalities of Kievan Rus as vassals. The Mongols went on invade Central-Eastern Europe, finally laying siege to Vienna. They would rule the land of the Rus for over two centuries.
And among their vassals was one most interesting personality who would become canonized as a saint, whose story even now tells us a great deal about Russia: Alexander Nevsky...